Electromagnetic talking machine



April 10, 1928. 1,665,784

- w. HORNAUER ELECTROMAGNETIC TALKING MACHINE I Filed June 20, 1925 2Sheets-Sheet l April 10, 1928. 1,665,784

w. HORNAUER ELECTROMAGNETIC TALKING MACHINE Fild June 20, 1925 2Sheets-Sheet 2 Patented Apr. 10, 1928.

UNITED STATES Will-LY HOBNAUEB, OI NEUIOLLN, GEBIANY, ASSIGNOB '10 V01MISELLSCHAIT, OF BERLIN, GERMANY.

ILIGIBOKAGKETIO TALKING momma.

Application filed June 20, 1925, Serial no. 38,559, and in Germany June88, 1824.

This invention relates to an elect-ro-magnetic talking-machine in whichthe sound is recorded and reproduced by means of a steel wire or bandwhich is passed from one I spool to another through a ma net box.

It is usual in machines of this kind to enclose the spools in a casingwhich is applied to and detached from the driving mechanism togetherwith the spools, and it is also usual 10 to have the magnet boxconnected to the same casing.

The main object of the present invention is to provide means which allowthe magnet box to be connected permanently to the mall chine, and theinvention consists in this respect in forming the spool casing with anaperture through which the magnet box can enter and leave the casingwhen the latter is applied to and withdrawn from the machine.

Another object of the invention is to provide means for preventingdisplacement of the s 001s in the casing when the latter is withdi'awnfrom the machine, and in this 2 respect the invention consists in theprovision of clutches arranged in the casing so as to engage the spoolswhen the latter are disengaged from the driving spindles.

Fig. 1 of the accompanying drawings represents a side view of themachine, the spools and the enclosing casing being shown in section andin detached position.

Fig. 2 is a sectional view of one of the spools showing the clutch inthe position it 85 occupies when the spool is attached to the drivingmechanism, and

Fi 3, a view of the detached spool casing s owing one spool and itsclutch in section.

Fig. 4 is a plan of one of the clutch elements.

The record band or wire H is held by two spools A and B which areapplied to the heads of spindles D for winding the hand from one spoolto the other, the driving mechanism for the spindles being onclosed in acabinet E. The spools are onclosed in a casing composed of two drums Cand an intermediate connecting arm M,

the casing being preferably composed of two shells which are pushed oneinto the other over the spools.

The magnets are enclosed in a box G which, according to the invention,is permanently mounted on the'cabinet E, the arm M being provided withslots F through which the box G is admitted when the casing and spoolsare applied .to the spindles D. When the s 001 casing is ap lied to themachine, the liox G' is opene to admit the band or wire H. Thiscompulsory openin of the box has the advantage that dust an metalarticles which happen to be present in the ox will be observed andremoved.

In order to secure the spools against rotary and other dis lacement inthe casing when they are detac ed from the spindles D, the followingarrangement is provided:

Two clutch elements N and O are formed with crown teeth whereby they canbe engaged to another. The element N is fitted in the boss of the spooland the element 0 is connected to the casing above it. A socket Lsecured to the casing serves as a guide for the element 0 and allows itto move in axial direction, a cross-pin K, which engages slots in thesocket, preventing rotary displacement. A coil spring I, arranged aboutthe socket L, bears against the clutch element 0 and tends to hold it inengagement with the element N, as shown in Fig. 3,,the spool being atthe same time forced against the bottom of the casing so that dislacement of the spool and a derangement o the wire in the casing will beprevented. When the spool casing is applied to the machine, the spindleD, which is brought up through the clutch element N, engages the element0 and disengages the clutch so that the spool can be rotated. Thisposition of the elements is illustrated in Fig. 2.

I claim:

1. In an electro-magnetic talking-machine of the character described, aspool casing, record spools enclosed in said casing, driving spindlesadapted to receive and to be coupled to said spools, and spring-pressedclutches engaging the spools in the casing so as to prevent normally adisplacement of the same, the driving spindles being adapted todisengage said clutches automatically on entering the spools.

2. In an electro-magnetic talking machine of the character described, aspool casing, record spools enclosed in said casin driving spindlesadapted to receive an to be coupled to said spools, a clutch membersemember on the spool and press the latter cured to each spool, a clutchmember against the cas ng, the spindles being mounted withinthecasingover each vspool a apted to'engage and displace the adjus- 10so as to be ca able of axial but not'rotary table clutch members so asto release the 5 adjustment ative to the casing, and a spools when thelatter are applied to the spring tending to hold said adjustable clutchmachine together with the casing.

member in engagement with the mating -WILLY HORNAUER.

